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RE: Look what I founded in your attic Mommy.

I'd be inclined to consider the 6П3C-E to be much closer to 5881 than a 7581. A translated data sheet calls out anode dissipation rating @ 20.5W while the 7581 is 30W and the 7581A is 35 W. I'm sure the 6П3C-E ratings are conservative because they're based on a 5,000 hr nominal life. I've run them @ 25W on the anode and they don't red plate or show other signs of distress.

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  Kimber Kable  

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